Effect of isotope mass on simulations of the high-mode pedestal and edge localized modes

Simulations of Joint European Torus (JET) [P. H. Rebut et al. , Nucl. Fusion 25, 1011 (1985)] type I high-mode (H-mode) discharges with edge localized modes (ELMs) are used to study the effect of isotope mass on the height of the pedestal and the frequency of ELMs. A dynamic model for the H-mode ped...

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Bibliographic Details
Published in:Physics of plasmas 2005-11, Vol.12 (11), p.112508-112508-9
Main Authors: Snyder, Stacy E., Kritz, Arnold H., Bateman, Glenn, Onjun, Thawatchai, Parail, Vassili
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOUNDARY LAYERS
CHARGED-PARTICLE TRANSPORT
CONTROL
EDGE LOCALIZED MODES
ELECTRIC DISCHARGES
H CODES
H-MODE PLASMA CONFINEMENT
ISOTOPE EFFECTS
J CODES
JET TOKAMAK
M CODES
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA PRESSURE
PLASMA SIMULATION
STABILITY
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Summary:Simulations of Joint European Torus (JET) [P. H. Rebut et al. , Nucl. Fusion 25, 1011 (1985)] type I high-mode (H-mode) discharges with edge localized modes (ELMs) are used to study the effect of isotope mass on the height of the pedestal and the frequency of ELMs. A dynamic model for the H-mode pedestal and ELM cycles is employed in the JETTO integrated modeling code [M. Erba et al. , Plasma Phys. Control. Fusion 39, 261 (1997)]. The stability criteria that are used to trigger ELM crashes in the JETTO simulations are calibrated with the HELENA and MISHKA ideal magnetohydrodynamic (MHD) stability codes [A. B. Mikhailovskii et al. , Plasma Phys. Rep. 23, 713 (1997)]. Results obtained using a pedestal model in which the pedestal width increases with isotope mass are compared with those obtained using a fixed, prescribed pedestal width. In JET type I ELMy H-mode discharges, it is found that the height of the pressure pedestal increases and that the frequency of the ELMs decreases as the isotope mass is increased. Both of these experimentally observed trends are obtained simultaneously in the simulations only if the pedestal width increases with isotope mass. The physical processes that play a significant role in these simulations are described.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.2136352